Quickie! Is 10.2.2.B the latest? That's what I have, but I've only recently brought the router back in to use, when my other one played up.
Fixed! Go to the fix.
Re: Is my TG582N firmware u.t.d?
There are different firmware versions intended for ADSL and for FTTC use. 10.2.2.B is the last firmware for ADSL use. 10.2.5.2.FO is the last firmware for FTTC. You can re-configure the 10.2.5.2 FTTC firmware and use it for ADSL, although the FO version does have a bug where it fails to re-enable the WAN Ethernet port for LAN use when switching from FTTC mode to ADSL mode (which can be solved using telnet commands).